Overview:By the inflow of surface water into the filter， it can clean the water quickly， raising the light penetration and helping the photosynthesis of water plants; According to the size of power head and your demand， you can adjust the flow of surface water by running the upper adjuster; It's easy to use and won't affect the filtering effect; Self-floating design can adapt itself to the water valve; Suitable for external hanging filter， such as AA360 / CY20 / EF-05， etc.Weight: 79g  Dimensions: 11.3 in x 1.1 in x 1.1 in (28.7 cm x 2.8 cm x 2.8 cm)  Color: Black  Model: I-521  Material: Plastic  Quantity: 1 Piece  Plug Specifications: US Plug (2-Flat-Pin Plug)  Packing List:  1 x Skimmer<img src="http://112.74.112.28/down/products/269759/269759_000.JPG" noproxy>